Venkateswarlu Gaddam, Gautam Sharma, Neelesh Kumar, Amod Kumar, S.K. Mahna NIT Kurukshetra Central Scientific Instruments Organisation (CSIO) Council for Scientific and Industrial Research(CSIR) Chandigarh,India

 Introduction  Objective  Materials and Methods  Observations  Results  Conclusion  References

 GRF- Ground Reaction Force It is equal in magnitude and opposite in direction to the force that the body exerts on the supporting surface through the foot.  Vertical GRF (Fz) & its importance- It is considered to be prominent amongst the three components of the GRF and has importance in the gait analysis, clinical assessment etc.  Force Plate (FP)- To measure GRF in the human and animal locomotion.  Available FPs- AMTI FP, Bertec FP, Kistler FP  Kistler FP- Standard Reference Tool  Developed FP  Calibration Techniques Static calibration Dynamic Calibration

 To measure static & dynamic calibration of Developed FP  Comparison of their (kistler FP & Developed FP) results

GRF MEASUREMENT WITH Kistler FP Vertical component of ground reaction force Subject walking on force plate Kistler Data Acquisition UnitPC with Analysis Software

 Type- 9286B (Switzerland)  Sensing Devices- Piezoelectric sensors  Cost-17 lacks  Plates- aluminum

 DAQ system for Bioware software  Type-5691A

 To measure & analyze the acquired signal  Force calculation  Moment calculation  Center of pressure (COP) calculation

Developed FP ( Design & Sensor arrangementDeveloped FP ( Design & Sensor arrangement) Experimental Setup Ni-DAQSoftware Tool Calibration Techniques Results

Plates (2)-Brass Sensors- Linear Pot Length- 60 cm Breadth- 36 cm Height- 7.4 cm Springs arrangement

NI USB inputs,16 bit,32Ms/s Multifunction I/O with correlated digital I/O for USB

 LabVIEW –Laboratory Virtual Instrument Engineering Workbench  LabVIEW Signal Express-8.6  Major Role Simulation  Data Acquisition Instrument Control Testing & Measurements Industrial automation  Data Analysis

 Calibration- calibration is a comparison between measurements-one of known magnitude or set with one device and another measurement made in a similar way as possible with a second device.  Purpose- to check if the developed FP gives the same measurement readings as the Kistler FP, thereby checking the repeatability, sensitivity, linearity of VGRF for the Developed FP.  Static Calibration: Input- Fixed Loads Output- Volts

 Dynamic Calibration Subject- Human being Input- Applied Force from human feet during walking Output- M-Shape curve in Volts

 Static Calibration Dynamic Calibration Load Vs Voltage

(N)

Range of Weight ( Kg) Sensitivity of Kistler FP (mv/N) Sensitivity of Developed FP (mv/N)

 To evaluate Gait Parameters which are used for Prosthetic Knee quantification  In clinical assessments to know data analysis of a patient  Inexpensive

 [1]. Senanayake S.M.N.A.(2004) Walking, Running and Kicking using Body Mounted Sensors. Proceedings of the 2004 IEEE. Conference on Robotics, Automation and Mechatronics Singapore. Pg  [2]. Hynd D.,Hughes S C.,Evins D J.( 2000) The development of a long, dual- platform triaxial walkway for the measurement of forces and temporal-spatial data in the clinical assessment of gait. Proc Instn Engrs vol 214 Part H: pg  [3]. Liu T., Inoue Y., Shibata K.(2009) 3D Force Sensor Designed Using Pressure Sensitive Electric Conductive Rubber. Journal of system design and dynamics, VOL 3 No 3 pg  [4]. Roland E.S., Hulla M.L., Stover S.M., (2005) Design and demonstration of dynamometric horseshoe for measurinh ground reaction loads of horses during racing conditions. Journal of Biomechanics 38 : pg

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